Compressor speed?

[Jrad235]

60 Gal. Compressor speed?

Hi all! Love this site, just thought I would get your opinion on my new toy.

I recently picked up a US General 5Hp, two stage, 60 Gal compressor. After fixing a few things on it(Broken pressure switch, etc) I've got it running. It says it is good for ~15cfm at 90 PSI, and is set from the factory at 165PSI cutoff. I am currently running it at 150PSI.
Has a mag switch installed and draws a steady 12 Amps from start to stop(Motor Rated at 22 Amps).

My question is this; How long do your 60 Gallon compressors take to hit 150 PSI from dead empty?

The pump specs state 1500 RPM and it takes 5 minutes and 20 seconds to hit shutoff. For the record I'm very happy with the machine so far, this uses the same pump as the BelAire 216V (Same compressor as far as I'm concerned) and didn't even cost me half.

http://www.amazon.com/dp/B0015S8IJ6/?tag=atomicindus08-20

What say you, GJ? By the way, I know it's not a "great" compressor, and I don't care. No posts of; It's gonna die soon. Or; It's junk.

 

[Fixnair]

On a two stage you can check the efficiency of the pump by checking the interstate pressure when the machine is running @125 PSI. The inter cooler is the finned tube connecting the large cylinder to the small cylinder. It should be between 25& 40 PSI.
You will probably have to remove the relief valve on the inter cooler and install a 0 to 100 PSI gauge in its place.
If your gauge reads within these numbers your compressor is making all the air it can. You should check your amp draw if you can too. If it is lower than nameplate rating then the drive pulley is probably too small. Doubt if that's the case though.

 

[Jrad235]

Actually, the amp draw is lower! (I edited my first post, sorry.)

 

[e-tek]

Actually sounds like a great compressor. True 2-stages are great macine. 165psi set at the factory seems really high - nothing needs that much pressure, but it'll definitely power tools for a while before getting under 100. Mine is an 18.5cfm at 90psi, and mine is set at 150 max and takes at least 5 minutes to get there. Sometimes seems like 10, but I don't have the stats.

 

[Jrad235]

That's good to know, I was slightly concerned since I saw the number 2.5(Minutes) somewhere on here. I'll have to look into the amp draw of the motor. Probably double check it with another meter, as much as I love my Fluke.

 

[Jrad235]

Well, I'm currently getting my mag starter rewired and then I'll double check the amp draw on the motor. Any chance they didn't match the motor and pump? From the sounds of it I could put a bigger pump on. I don't think I would want to spin this one any faster.